JPH1182333A - Scroll fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll fluid machine wherein a driving scroll and a driven scroll are eccentric, and synchronously rotated, a main body compression part optionally becomes oil free, and a synchronous mechanism is lubricated by oil, and is separated into two parts workable at a normal temperature. SOLUTION: In a scroll fluid machine, a driving scroll 3 and a driven scroll 6 are eccentric, and are synchronously rotated respectively, a scroll teeth lap part is not formed to a center of the scroll to form a space, a cylindrical shielding wall 4a for partitioning the space and the lap part, is mounted, the space is cooled by aeration, and a central Oldham's coupling of grease lubrication for supplying the grease to a fitting part from a grease sump by both shaft hubs 13, 14 and a torque disc 15 for the connection, is mounted. Whereby a balance weight and a pin crank become unnecessary, the scroll compression part can be easily made oil free, the Oldham's coupling is made of a metallic material and is provided with long life and high abrasion resistance, further a number of pieces of components can be reduced, the accuracy can be improved, and the cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a full-rotation scroll fluid machine used for a blower or a vacuum pump.

[0002]

2. Description of the Related Art In a conventional full-rotation scroll fluid machine, a compression chamber in which both eccentric scrolls are rotated about their respective axes, and the two eccentric amounts of the two scrolls are wrapped around the two scrolls at a fixed angle difference. And synchronously rotating both scrolls to sequentially move and reduce the compression chamber. In this configuration, the most widely used first method is to rotate the driving scroll, make the driven scroll contact the driving scroll side wall and the scroll, and rotate it by the frictional force. or,
As a second method, there is a method in which an arm engaged from the outer peripheral portions of both scrolls and an Oldham coupling related to the arm make a contact configuration in consideration of synchronous rotation. Further, as a third method, both the refueling type and the non-refueling type are configured to perform synchronous rotation by a central Oldham coupling formed on each axis of both scrolls.

[0003]

The above-mentioned first and second methods use a scroll and a synchronous rotation mechanism to drive,
Since it is a driven mechanism, the scroll teeth and the synchronous rotation mechanism are worn, and the operating noise due to the metallic contact is loud, which causes noise. Furthermore, the structure cannot be operated unless lubricating oil is interposed in all the components. In the third method, a center Oldham's joint is mounted on the rotation and the axis of both scrolls. This space is a compression chamber having a discharge port and a high compression ratio. Oldham fittings
Seizure may occur due to dilution of the lubricating oil or thermal expansion of the torque disk and the shaft connecting member. In addition, the oil-free center Oldham's joint is the subject that needs to be solved most in terms of the high temperature resistance of the self-lubricating material and the heat-resistant wear during continuous operation, and the selection of the self-lubricating material is extremely difficult. is there.

[0004]

As means for solving the above-mentioned problems, a driving scroll and a driven scroll are used.
The scroll center portion is a space in which the scroll tooth wrap portion is not engaged, and a cylindrical shielding wall is provided in the space,
The outer cylindrical portion of the cylindrical shielding wall is configured as a final compression chamber,
A structure in which a discharge hole is perforated in the scroll head plate of the constituent space is defined as the invention of claim 1. Next, a sealing ring is fitted to the end of the cylindrical shielding wall to complete the sealing, and the inside of the cylindrical shielding wall is cooled by ventilation. or,
In order to promote ventilation cooling, an axial fan is provided on the inner side wall of the cylindrical shielding wall. Furthermore, a grease lubricated center Oldham's joint is provided inside the cylindrical shielding wall,
According to a fourth aspect of the present invention, perfect synchronous rotation is performed.

[0005]

In the operation performed by the structure shown in the means for solving the above-mentioned problems, in the conventional structure, as shown in FIG. 8, the scroll center direction of both scroll teeth 2a and 6a is close to the axis, The central space 4d reaches a high temperature because it constitutes a part. Therefore, the present invention provides a cylindrical shielding wall in the central space, the outer region of the cylindrical shielding wall as a final compression chamber,
In addition, since the inside of the cylindrical shielding wall has a ventilation structure with the atmosphere after the sealing, the temperature of the inside becomes low. Also, depending on the configuration, an axial fan is provided, so that the temperature can be set even lower. Even when a metal-based torque disk and a shaft connecting member are mounted as a central Oldham coupling inside the cylindrical shielding wall, normal grease lubrication can be performed because of rotation and operation in a low temperature range, and eccentric drive In the scroll and the driven scroll, the backlash can be kept at zero, the two scrolls can be rotated synchronously, and there is no wear and no thermal expansion.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described with reference to necessary drawings in FIGS. FIG. 1 shows an embodiment of the present invention. As the scroll blower fluid machine all rotary double type scroll 2 is driven scroll, 2a holds the eccentricity m and 6 driven scroll, the scroll teeth lap portion of the 6a, the compression chamber V ₁ and V ₂ By the synchronous rotation of the two scrolls, the fluid flowing from the 17 fluid suction port is compressed from the outer periphery to the center while reducing the compression chamber. Reference numeral 4a denotes a cylindrical shielding wall, which constitutes four final compression chambers outside the cylindrical shielding wall. Reference numeral 4b denotes a seal ring for sealing the final compression chamber and the inside of the 5-cylindrical shielding wall. 7 of 6 driven scrolls,
The compressed fluid is discharged from the 18 fluid discharge ports through the 9 discharge holes. 3 is a prime mover shaft and the shaft hole of 2 driving the scroll boss fitted with snug fit, to rotatably engage with a C ₁ axis in first casing. 6c driven scroll boss part,
8 side cover boss and C through bearing and oil seal
_{The two} shafts are rotatably engaged.

[0007] as a center Oldham coupling 13 is fitted to the second drive scroll, _{C 1} axis with the drive shaft hub, 14
Is a driven shaft hub that fits and engages with six driven scrolls, _two C axes, and encloses a 15 torque disk. The 13 drive shaft hub and the 14 driven shaft hub are provided with 16 grease reservoirs to grease the rectangular grooves of the 15 torque disk. The grease can be supplied from the cooling fan mounting end of the 14 driven shaft hub. The eccentricity m and C ₁ axis and C ₂ axis, at eccentricity and the Oldham's coupling structure,
The scroll tooth wrap portions 2a and 6a are engaged and configured.
The amount of eccentricity m is determined by the scroll tooth pitch, the scroll tooth thickness, and the number of scroll vortices. Reference numerals 2b and 6b denote gaps between the scroll end plates and the scroll end plates which engage with the tip of the scroll teeth. Reference numeral 12 denotes a sirocco fan which inspires the atmosphere from the 11 vent holes by rotation, discharges the gas inside the 5 cylindrical shielding wall from the 10 vent holes, and drives the 2 drive scroll to the 21st.
Cool as indicated by the arrow. The 19 cooling fan cools the 6 driven scroll side. FIG. 2 shows a configuration in which the cylindrical shielding wall is not integrally formed with the scroll head plate, and 4c is a single cylindrical shielding wall fitted to the scroll head plate.

Next, the above-mentioned center Oldham coupling structure and the synchronous rotation operation of the two-drive scroll and the six driven scroll will be described with reference to FIG. In the FIG. 3, (A) the figure, in a state where the lap portion 2a In the driving scroll seals the compression chamber V _1, 6a driven scroll teeth 90 ° relative 2a driven scroll teeth (single form 180 ° Rotate with a phase difference of ()). (B) the figure shows a state where the lap portion is sealed compression chamber V ₂ at 6a driven scroll 180 ° position. One rotation, V ₁₂ degrees as shown in (A), (B), (C), (D),
This is an operation configuration for sealing a compression chamber of V2 ₂ degrees, a total of 4 degrees.
4a is a cylindrical shielding wall, and the compression by the wrap portion of the scroll teeth is constituted up to 4 final compression chambers. These operations require that the two-drive scroll and the six driven scroll rotate synchronously at the same angular velocity, and the configuration thereof will be described below.

The fitting tolerance between the rectangular projections 13a and 14a of the double-shaft hubs 13a and 14a shown in FIG. 7 and the rectangular groove 15a of the torque disk 15 is about H6 / g6. Further, since the 15 torque disc has the fitting portion of the 15a at two positions on both sides in a form of crossing at a position of 90 °, the eccentricity m of both the C ₁ and C ₂ axes is synchronously rotated. Has the ability to absorb completely. The
The two-axis hubs 13 and 14 and the torque disk 15 have a central Oldham's joint structure that supplies grease to the fitting portion 15a from the grease reservoir and connects the same, so that the related parts can be worn and deformed. Absent. The backlash is reduced to zero by adopting a metal material that can guarantee that the torsional rigidity (degree / kg-cm), which indicates how many twists occur in the radial direction with respect to the torque, can be set to zero. Can be. Also, since the sliding of the fitting portion of 15a of the 15 torque disk is sliding by the amount of eccentricity m per rotation,
Almost no heat generation occurs. Furthermore, since the inside of the five-cylindrical shielding wall can be kept at a low temperature by the ventilation holes 10 and 11, the central Oldham coupling can be operated continuously under favorable conditions. Also, as shown in FIGS. 5 and 6, by providing the 10a axial flow fan on the five cylindrical shielding walls, the ventilation cooling effect is further improved. When a scroll vacuum pump is configured, the rotary seals of both scroll boss portions may be fitted. The present invention can also be applied to a full-rotation single-type scroll fluid machine configured to perform synchronous rotation.

[0010]

As described above, according to the present invention, the compression chamber and the inside of the cylindrical shielding wall are separated by the cylindrical shielding wall, and the inside of the cylindrical shielding wall can be maintained at a low temperature by a ventilation structure. The Oldham couplings and related parts installed inside the shading walls do not leak grease and do not deform or wear. Therefore, the backlash can be kept at zero for a long time, so that the synchronous rotation operation is not accelerated or delayed. Since the inside of the cylindrical shielding wall also performs forced ventilation with a sirocco fan on the driving scroll side and an axial flow fan provided inside the cylindrical shielding wall, the final compression chamber is cooled by the cylindrical shielding wall, The temperature of the discharged fluid can be reduced.
Since the synchronous rotation of the central Oldham coupling is stable, the wrap portions of both scroll teeth can be engaged with a small gap,
An oil-free scroll fluid machine can be easily configured.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a full-rotation type double scroll fluid machine according to the present invention.

FIG. 2 is an overall configuration diagram of a full-rotation type double scroll fluid machine also having a cylindrical shielding wall fitted thereto.

FIG. 3 is a transition diagram of a scroll tooth wrap of the full-rotation type double scroll fluid machine.

FIG. 4 is a front view of a scroll tooth of the full-rotation type double scroll fluid machine.

FIG. 5 is a side view of an axial flow fan of the full-rotation type double scroll fluid machine.

FIG. 6 is a front view of the axial flow fan of the full-rotation type double scroll fluid machine.

FIG. 7 is a three-dimensional view of a hub and a torque disk of the center Oldham coupling.

FIG. 8 is a transition diagram of a scroll tooth wrap of a conventional structure of a full-rotation type double scroll fluid machine.

[Explanation of symbols]

1 casing 2 drive scroll 2a drive scroll teeth 2b, 6b tip seal 3 motor shaft 4 final compression chamber 4a cylindrical shield wall 4b ... Seal ring 4c ... Single, cylindrical shield wall 5 ... Inside cylindrical shield wall 6 ... Scroll driven 6a ... Scroll driven tooth 7, 9 ... Discharge hole 8 ... ... Side cover 10, 11... Vent hole 12... Sirocco fan 13... Drive shaft hub 13a... Drive shaft hub rectangular projection 14... Drive shaft hub 14a. Hub rectangular projection 15 Torque disk 15a Torque disk rectangular recess 16 Grease reservoir 17 Fluid suction port 18 Fluid discharge port 19 Cooling fan 20 ……… Motor 21 ……… Drive wheel Le cooling air flow C 1 _......... driving scroll axis C 2 _......... driven scroll axis m ............ eccentricity

Claims (4)

[Claims] 1. A scroll comprising a casing, a side cover, a driving scroll, and a driven scroll, wherein the driving scroll rotates about a driving axis, and the driven scroll rotates about a driven axis eccentric to the driving axis. Both scrolls rotate synchronously, and on each end plate of driving and driven scrolls,
The two scroll teeth, which are provided in the axial direction and form a wrap portion that functions as a compression chamber that compresses the fluid from the outer periphery toward the center, are engaged and configured with a certain angular difference,
The scroll center of the driving scroll and the driven scroll does not engage with the scroll tooth wrap portion and is a space, and a cylindrical shielding wall is provided in the space formed by one of the scrolls, and the outer region of the cylindrical portion of the cylindrical shielding wall is finally compressed. A discharge hole is provided in the scroll end plate located in the final compression chamber, and the wrap portion maintains the engagement to the final compression chamber, and the driving scroll and the driven scroll are synchronized by a single driving source. A scroll fluid machine having a rotating configuration. 2. The inside of both scroll wrap portions and the cylindrical shielding wall is completely sealed with a seal ring at the tip of the cylindrical shielding wall, and the inside of the cylindrical shielding wall is a scroll head plate, both side surfaces. 2. The scroll fluid machine according to claim 1, wherein said scroll fluid machine is configured to be cooled by ventilation through said ventilation hole. 3. The scroll fluid machine according to claim 1, wherein an axial fan for exhaust is provided on an inner side wall of the cylindrical shielding wall. 4. A shaft connecting member and a torque disk are mounted as a central Oldham coupling that rotates synchronously while maintaining an eccentric amount in each axial space of the driven scroll and the driven scroll, and the shaft connecting member and the torque 2. The scroll fluid machine according to claim 1, wherein the disk is provided with a grease reservoir and configured to rotate and operate with grease lubrication.